*{
    margin: 0;
    padding: 0;
}
.danxuanF{
    width: 1000px;
    height: 500px;
    border: 1px solid black;
    display: none;
}
.duoxuanF{
    width: 1000px;
    height: 500px;
    border: 1px solid black;
    display: none;
}
.tiankongF{
    width: 1000px;
    height: 500px;
    border: 1px solid black;
    display: none;
}